Permanent low level in data line – critical

What does F13.18 mean?

Encoder 1's data signal line is permanently stuck at a low level, indicating a critical communication issue. This suggests a wiring problem (e.g., short to ground) or a defective encoder, preventing reliable position feedback and risking uncontrolled drive behavior.

• Short circuit between the encoder data line (e.g., A signal) and ground (0V) in the encoder cable.
• Defective encoder output stage causing the data line to be held low permanently (internal encoder fault).
• Incorrect wiring or pin assignment in the encoder cable, connecting a data line to 0V (e.g., incorrect crimp).
• Damaged or faulty encoder input circuit on the drive's control board or feedback module.
• Excessive cable length or unshielded cable causing signal degradation or noise that biases the signal low.

Click steps to track your progress.

1. 1

   Disconnect encoder cable from drive and encoder. Use a multimeter to check for continuity between the affected data line (e.g., A signal) and the 0V conductor within the encoder cable.

2. 2

   Verify the encoder's supply voltage (e.g., 5VDC or 24VDC) at the encoder connector using a multimeter while powered, ensuring it's stable.

3. 3

   Inspect the encoder cable for physical damage, pinching, or crushing that could cause internal shorts.

4. 4

   If available, swap the encoder with a known good one to determine if the fault is internal to the encoder unit.

5. 5

   Check drive parameters related to encoder type and signal levels (e.g., Parameter P6-01, P6-02) to ensure they match the connected encoder specifications.